Process of manufacturing color leaf.



GOHEI IWA'ISUBO, 0F KIOTO, JAPAN.

PROCESS OF MANUFACTURING COLOR LEAF.

No Drawing.

To aZZ whom it may concern:

Be it known that I, Goniu IWATsUBO, manufacturer, a subject of the Emperor of Japan, residing at No. 24 Hontoro-Machi, 'llalmkura-Nisl1i-lru, Matsubara-Dori, Shimodiiodfiu, city of Kioto, Empire of Japan, have invented certain new and useful Improvements in the Process of lldanufacturing Color Leaf, of which the following is a specification.

My invention has relation to a new or in1- proved process of manufacturing color leaves suitable for use in printing and analogous purposes, which consists in first immersing a coarse-grained plate into a certain volatile solution such for instance as camphor dissolved in naphtha, and subsequently coating with a layer of color mixture, and heating, whereby, by utilizing the volatile action of the said camphor, the leaf is loosened from the surface of the said plate, and has for its object to obtain a color leaf which may be manufactured in simple and easy manner and sold at a comparatively low cost.

To this end the heating plate upon which my improved leaf is to be prepared may be of any suitable heat conductive material such as tin plate, plate glass, copper plate, or the like.

First of all the upper and lower surfaces of the plate used are essentially roughened or coarse grained, preferably by grinding or rubbing with emery powder, so as to form upon the surfaces of the said plate an infinitive number of recesses or cavities thereof.

The plate thus roughened or coarse grained will be then immersed in the solution consisting of 100 parts of volatile oil, naphtha for instance, and 15 parts of crude camphor.

Then the plate thoroughly coated with the said volatile solution is taken out and the volatile element or naphtha has been volatilized, leaving only the camphor filled in the said infinitive number of recesses the color mixture prepared as hereinafter stated will be coated on or painted over the camphor bearing surfaces of the plate.

The proportions of the said color mixture, though varying to some extent the nature of the color used, should be usually as follows: 100 parts of Water, 10 parts Specification of Letters Patent.

according to Patented May 29, 19917.

Application filed May 31, 1916. Serial No. 101,004.

of gelatin, 5 parts of glycerin, 2 parts of syrup of the ordinary sugar and water variety, and the necessary amount of desired color whose proportions are taken by Weight.

To the above ingredients, I add further one part of starch, the employment of starch, I have found, renders the mixture substantially impermeable to air, so that the camphor, when volatilized by heating, will be prevented from escaping through the leaf, all as more fully hereinafter described.

The color mixture prepared as stated above may be painted in any suitable manner evenly over the surfaces of the plate and the camphor, and dried until eventually solidified to the form of a leaf of moderate thickness. Heat is then applied in the usual manner.

It Will be seen that by applying heat the camphor element filling the said infinitive number of the recesses formed upon the surfaces of the plate will be soon 'volatilized and tend to pass through the coating of the color, but in View of the starch mixture contained in the said color, which makes the color substantially gas tight, as stated above, the passage of the volatilized camphor Will be checked.

The consequence would be volatilized camphor through the leaf tends from the surface of the plate.

In order to moderate too quick volatilizetion, the volatile solution above referred to may, if desired, be admixed with about 2 parts of stearin.

To obviate dificulty of removing the leaf from the surface of the'plate, it has been proposed to intcrpose between the plate and leaf a certain wax material such as paratlin or like other substances, but this method is not satisfactory as it leaves a trace of wax upon the surface of the goods manufactured, Which not only degrade the value of the goods but at the same time disadvantageously increases the cost of manufacture. This defect I am enabled to overcome by replacing the paraflin with the camphor, the adoption of which camphor eliminates all such tedious operations as are necessary when a special solvent is prepared for softening the wax material interposed between the plate and color.

My improved leaf has the advantage of such that the failing to escape to loosen the same being exceedingly cheap and capable of possessing fine quality, since the trace of the camphor element, if any, would be removed by volatilization immediately upon exposing to the air.

Having fully described my invention,

what I desire to secure by Letters Patent 1. The process of manufacturing" color leaf which consists in first immersing a plate into a volatile solution consisting of 100 parts volatile oil and 15 parts crude camphor removing said plate applying thereto a color mixture, consisting of 100 parts water, 10 parts gelatin, 5 parts glycerin and 2 parts syrup in addition to the necessary amount of color, and subjecting the plate to heat, to loosen the leaf from the surface of the plate.

2. The process of .manufacturing color leaf which consists in first immersing a plate into a volatile solution consisting of 100 parts volatile oil, 15 parts crude camphor and 2 parts stearin removing said plate applying thereto a color mixture, consisting of 100 parts water, parts gelatin, 5 parts glycerin tion to the necessary amount of color, and

Copies of this patent and *2 parts syrup in addisubjecting the plate to heat, to loosen the leaf from the surface of the plate.

3. The process of manufacturing color leaf which consists in first immersing a plate into a volatile solution consisting of 100 parts volatile oil, parts crude camphor, 2 parts 'stearin removing said plate applying thereto a color mixture, consisting of 100 parts Water, 10 parts gelatin, 5 parts glycerin, 2 parts syrup and 1 part starch in addition to the necessary amount of color, and subjecting the plate to heat, to loosen the leaf from the surface of the plate.

-'l. The process of manufacturing color leaf, which consists in first immersing a plate into a solution of camphor, removing said plate and drying, applying thereto a coating of non-permeable color mixture, and subsequently heating to vaporize the camphor and loosen the leaf from the surface of the plate.

In testimony whereof I affix my signature in presence of two witnesses.

GOT-IE1 IWATSUBO. [n s.]

Witnesses W. EBIHARAH, ISAMU SAKAI.

may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

